How To Install Dimmer Switch Without Neutral
How to Install a Dimmer Switch
How to Install a Dimmer Light Switch
Time
A total solar day
Complexity
Intermediate
Cost
Less than $20
Introduction
There's more to changing a switch than connecting a few wires. Yous have to check grounding and box size for a safe, offset-class job. It'southward easy to install a dimmer switch, but brand sure to upgrade the wiring if necessary to make information technology safer and run across Electrical Code requirements. We'll show you how to clinch a rubber installation.
Tools Required
Materials Required
- Dimmer switch
- Wire connectors
Getting Started: Tools and Power
It doesn't accept long to replace an ordinary light switch with full-characteristic dimmable switches. Only while you're at information technology, to make your abode safer, you should upgrade the wiring to meet the latest requirements of the National Electrical Lawmaking. Our stride-by-footstep instructions volition show yous how to install the dimming switch, concentrating on details that volition guarantee a safe installation.
The tools you'll need to install a toggle dimmer switch are cheap and will come in handy for all your electric projects. You'll need a screwdriver, wire stripper, inexpensive (ii atomic number 82 wire type) voltage tester and needle-nose pliers to install a dimmer.
Wiring problems and mistakes are all too common, and if left uncorrected take the potential to crusade short circuits, shocks and even fires. Hither are the pinnacle 10 electrical mistakes people make and how to gear up what you notice.
Projection stride-by-step (12)
Pace 1
Choosing a Dimmer
There are several types of dimmer switches out in that location. Nosotros show the single switch but there are also iii-mode dimmers, CFL and LED dimmer switches.
Step ii
Check for Hot Wires
To begin, turn off the power and double-check for hot wires in the box. Turn on the light and have a helper scout as you lot switch off the excursion breakers, or unscrew the fuses one at a fourth dimension until the light goes out. Get out this excursion turned off while you work.
We're using a not-contact voltage detector to double-check for voltage earlier removing the dimming switch. We prefer this type of tester because information technology'll discover voltage without direct contact with the metal conductor. That's huge—it means you can check potentially hot wires before you handle them.
Hold the tip of a not-contact voltage detector near each screw terminal to exist sure the power is off. After you lot unscrew the switch and pull it away from the box, probe effectually inside the box with the detector to make certain there are no other hot wires from another circuit.
Plus, acquire how to troubleshoot a dead outlet here.
Telephone call an electrician if the original switch is connected to two white wires. This may point a dangerous switched neutral. Also, if you have aluminum wiring, don't mess with information technology! Call in a licensed pro who is certified to work with information technology. This wiring is dull grayness, not the dull orangish that's characteristic of copper.
Step iii
Common Metal Box Sizes
Too many wires and devices stuffed into a box tin cause dangerous overheating, brusk-circuiting and fires. The National Electrical Code specifies minimum box sizes to reduce this risk.
To effigy the minimum box size required by the electrical lawmaking, add together 1 for each hot and neutral wire entering the box, i for all the ground wires combined, 1 for all the clamps combined, and 2 for each device (switch or receptacle) installed in the box. Multiply this figure by ii for fourteen-estimate wire and two.25 for a 12-gauge wire to go the minimum box volume in cubic inches.
To help determine the estimate of the wire in your switch box, wait at the amperage of the circuit breaker or fuse in the main electrical panel. Fifteen-amp circuits are usually wired with fourteen-judge wire and twenty-amp circuits require 12-gauge or heavier wire.
Compare the effigy you go with the volume of your existing box. Plastic boxes have the volume stamped within, normally on the back. Steel box capacities are listed in the electrical code. Nosotros've listed the volume of the most common steel boxes in the nautical chart higher up.
Step four
Make Sure the Box is Big Enough
If y'all have a steel box, measure the height, width and depth of it to determine the box volume and consult the chart to meet if it'south large enough. Plastic boxes have their volume stamped inside. If your box is also small, replace it with a larger one. It'south possible to replace a box without cutting abroad the wall, but it's a tricky task. We recommend simply removing almost a 16-in. square of drywall or plaster and patching it after the new big box is installed.
Tip: If the excursion billow is labeled "15 amp, " the wires are probably 14-gauge, or 12-gauge for 20-amp excursion breakers.
Pace five
Examination Your Footing Earlier You Connect It
New dimmers have either a dark-green grounding wire or a greenish ground screw that you'll take to connect to a grounding source if one is available. Houses wired with plastic-sheathed cablevision almost always have blank copper ground wires that you'll connect to the toggle dimmer switch. Simply examination first using a neon voltage tester to verify that the wire is connected to a footing.
Some wiring systems, similar ours, rely on a metal conduit for the footing. If you have ane of these systems, exam the metal box with a neon voltage tester to verify that it's grounded. If information technology is, attach a brusk ground wire to the metal box with either a metal grounding prune or a green grounding screw screwed into the threaded hole in the back of the box. Then connect information technology to the dimmer.
If testing reveals your box isn't grounded, you can withal install the dimmer, only you must use a plastic embrace plate and make sure no bare metallic parts are exposed. Test information technology once again for a basis. Turn the ability back on. Then place the leads of a voltage tester between each spiral concluding and the metal box. If the tester lights, the box is grounded.
Turn off the ability again earlier proceeding.
Step 6
Install the New Dimmer and a Grounding Clip
The steps are basically the same for how to install a switch. Press a grounding clip and 6-in. length of bare copper wire onto the metal box with a screwdriver. Cutting away a little bit of drywall under the box to provide clearance for the prune.
Step vii
Pinch the Wire Terminate
Bend the ground wire back onto the clip and clasp it downward tight then it won't interfere with the dimmer switch.
Stride 8
Strip New Wire Ends
Clip off the bent end of each wire with the wire cutter. Strip 3/8 in. of insulation from the cease of the wires.
Learn how to properly prep wire.
Step 9
Connect the Wires
Some dimmers, similar the 1 we're installing, have stranded wires attached. Concord the wires together with the stranded wire protruding about 1/viii in. beyond the solid wire. Friction match the size of the wire connector you're using to the size and number of wires being connected. Check the manufacturer'south specifications on the package to exist sure. Twist a plastic wire connector clockwise onto the wires to connect them. Terminate twisting when the connector is snug.
Other dimmers have screw terminals instead of the attached stranded wires to the new dimmer. For the dimmers with spiral terminals, strip 3/4 in. of the insulated covering from the wires in the box and curve a loop in each with needle-nose pliers. Place the loop clockwise effectually the screw terminals and close the loop around the screws with the needle olfactory organ pliers. Then tighten the screws.
Step 10
Attach Cover Plate for the Wall Dimmer Switch
Fold the wires neatly into the box. Screw the dimmer to the box with the screws provided. End the job by installing the cover plate and turning on the power to examination the new dimmer.
It doesn't matter if you reverse the 2 switch wires to a single-pole dimmer. But if you lot're replacing a iii-way switch with a three-manner dimmer, label the "common" wire (it'll be labeled on the erstwhile switch) when yous remove the old switch then you lot can connect it to the "common" final on the dimmer.
Plus, learn how to change a unmarried-pole switch to a 3-way switch.
In nigh cases, the ii switch wires will be some color other than greenish or white, usually black. But one of the wires may be white if your firm is wired with plastic-sheathed cable. Put a wrap of black tape around the white conductor to characterization it as a hot wire.
Step eleven
Buying Dimmers
If the switch y'all're replacing is the only switch controlling the light, buy a standard single-pole dimmer. If the light can be switched on and off from two or more than switches, buy a 3-way dimmer switch. Simply you won't be able to dim the lights from every switch location unless yous buy a set of special dimmers with advanced electronics and install one at each switch location.
Footstep 12
Watts
Nearly dimmers are designed to handle 600 watts. Add up the wattage of all the light bulbs you lot'll exist dimming. So read the dimmer package to make sure it can handle the load. Heavy-duty ane,000- and 1,500-watt dimmers are likewise readily available. Read the bundle if you'll be installing dimmers side by side in the same electric box considering the wattage rating is reduced to recoup for extra heat buildup.
Finally, you have to utilize a special device, not a dimmer, to control the speed of ceiling fans and motors. About fluorescent lights can't be dimmed without altering the fixture.
Whether you're looking to add a light fixture or run rough electrical for an improver, here are x primal facts that your electrician wishes you knew.
Source: https://www.familyhandyman.com/project/how-to-install-a-dimmer-switch/
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